Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais candidatos concorreram na eleição quando John S. Wood era o titular?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR) CREATE TABLE managerial_head_coach_changes (managerial_head_coach_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Incoming manager VARCHAR, Date of appointment VARCHAR) CREATE TABLE united_kingdom (united_kingdom_id AUTO_INCREMENT PRIMARY KEY, Episode number Production number VARCHAR, Title VARCHAR, Original airdate VARCHAR, Time of airing VARCHAR, Total viewers on Hallmark INT, Total viewers on Hallmark+1 INT, Total viewers INT, Rank on channel VARCHAR) CREATE TABLE women's_doubles:_14_6_titles_8_runner-ups (women's_doubles:_14_6_titles_8_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE goalkeeping_leaders (goalkeeping_leaders_id AUTO_INCREMENT PRIMARY KEY, No. INT, Player VARCHAR, Club VARCHAR, Games Played INT, Minutes INT, Goals Against INT, GA Average VARCHAR, Wins INT, Loses INT)  
SELECT Candidates FROM  WHERE Incumbent = John S. Wood